package com.example.hospital.api.common.handler;

import com.example.hospital.api.annotations.ResponseResult;
import com.example.hospital.api.common.Result;
import lombok.extern.slf4j.Slf4j;
import org.springframework.core.MethodParameter;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice;

import javax.servlet.http.HttpServletRequest;

@ControllerAdvice
@Slf4j
public class ResponseResultHandler implements ResponseBodyAdvice<Object> {
    public static final String RESPONSE_RESULT_ANN = "RESPONSE_RESULT_ANN";
    @Override
    public boolean supports(MethodParameter returnType, Class<? extends HttpMessageConverter<?>> converterType) {
        ServletRequestAttributes sra = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes());
        HttpServletRequest request = sra.getRequest();
        //判断请求是否有标记
        ResponseResult responseResultAnn = (ResponseResult) request.getAttribute(RESPONSE_RESULT_ANN);
        return responseResultAnn == null ? false : true;
    }

    @Override
    public Object beforeBodyWrite(Object body, MethodParameter returnType, MediaType selectedContentType, Class<? extends HttpMessageConverter<?>> selectedConverterType, ServerHttpRequest request, ServerHttpResponse response) {
        log.info("进入返回体重写格式。。。。。");
        return Result.success(body);
    }
}
